e6.0.0 Added file format change and security option support.

builder.go

@@ -15,6 +15,8 @@ type Builder struct {
 	opts            LoadOptions
 	defaults        any
 	tagName         string
+	fileFormat      string
+	securityOpts    *SecurityOptions
 	prefix          string
 	file            string
 	args            []string
@@ -50,6 +52,14 @@ func (b *Builder) Build() (*Config, error) {
 		tagName = "toml"
 	}
 
+	// Set format and security settings
+	if b.fileFormat != "" {
+		b.cfg.fileFormat = b.fileFormat
+	}
+	if b.securityOpts != nil {
+		b.cfg.securityOpts = b.securityOpts
+	}
+
 	// 1. Register defaults
 	// If WithDefaults() was called, it takes precedence.
 	// If not, but WithTarget() was called, use the target struct for defaults.
@@ -148,6 +158,23 @@ func (b *Builder) WithTagName(tagName string) *Builder {
 	return b
 }
 
+// WithFileFormat sets the expected file format
+func (b *Builder) WithFileFormat(format string) *Builder {
+	switch format {
+	case "toml", "json", "yaml", "auto":
+		b.fileFormat = format
+	default:
+		b.err = fmt.Errorf("unsupported file format %q", format)
+	}
+	return b
+}
+
+// WithSecurityOptions sets security options for file loading
+func (b *Builder) WithSecurityOptions(opts SecurityOptions) *Builder {
+	b.securityOpts = &opts
+	return b
+}
+
 // WithPrefix sets the prefix for struct registration
 func (b *Builder) WithPrefix(prefix string) *Builder {
 	b.prefix = prefix